From: notsaying@nospicedham.127.0.0.1   
      
   On Tue, 20 Apr 2021 14:52:58 GMT, wolfgang kern   
    wrote:   
      
   > On 20.04.2021 17:55, Robert Prins wrote:   
   >> Just came across this one:   
   >>   
   >> C4 1C 9F AB 47 47 EB F9   
   >>   
   >> Save as a .COM file and run it, even in DOSBox-X. (Do a CLS before   
   >> you start it)   
   >>   
   >> Comparable to a gem like "+[>,]+[<.-]" in that language that usually   
   >> has an '*' in it's name. ;)   
   >>   
   >> Robert   
   >   
   > I can't recommend to do this!   
   >   
   > endless:   
   > LES BX,[SI]  ;SI=?? may depend on environment   
   > LAHF         ;who knows what's in the flags ?   
   > STOSW        ;WRITE to ES:DI (try to use cc-flags for color)   
   > INC DI dup2  ;stosw does this also   
   skips next scrn char   
      
   > JMP $-7      ;endless or until crash   
   >   
   > BX isn't used.   
   except to set es.   
      
   > And if SI doesn't point to the screen-seg it writes to another 64KB   
   > block. __   
   > wolfgang   
   >   
   >   
      
   I presume it's meant to put stripes down the screen; but al is 0 at start;   
   aha! I see the jmp goes to 101, which becomes SBB al,9F   
      
   I thought a .COM file at startup has bx=0x0000,si=0x0100,di=0xFFFE,   
   es=ds=cs;   
   LES must somehow pick up the Screen seg.   
      
      
      
   OK it's a mini 'Matrix' tribute. Nice.   
      
   --   
   Bah, and indeed, Humbug.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)